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Full text of "Maintenance and Repair"

HP OfficeJet Pro L7580 Teardown 



MakejProjects 



HP OfficeJet Pro L7580 
Teardown 

Written By: Umut Erkal 



TOOLS: 

T8 Torx Screwdriver (1) 
T20Torx Screwdriver (1) 
Tweezer (1) 
Wire cutter/stripper (1) 



SUMMARY 

L7580 is a great multifunction printer from HP. Here we will discover what's inside the printer 
and remove its sensors and DC motors. 



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HP OfficeJet Pro L7580 Teardown 



Step 1 — Removing the automatic document feeder. 





iSBJ 



Remove the three T8 Torx screws from the paper feeder. 

• Lift the white surface to reveal the two notches. 

• Push the notches to detach the paper feeder mechanism. 

Step 2 




After removing the paper feeder, you will notice the slotted opto switch. 

• Remove the back cover to demount cable jacks. 

• Pull and detach the paper feeder mechanism. 



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HP OfficeJet Pro L7580 Teardown 



Step 3 




• Remove the T8 Torx screws from the right cover. 

• You will see the feeder's mechanics after removing the cover. 

• Remove the top cover, and here is the first DC motor and its encoder. 

Step 4 — Removing the top cover 




Pull the scanner cover up to detach it from the main body. Then, remove the T8 Torx 
screws around the scanner window. 

• Remove the control panel by pulling it. 

• Finally, remove the inner layer of the control panel by forcing the notches. 



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HP OfficeJet Pro L7580 Teardown 



Step 5 




• Remove the flat cable from the control panel. 

• Remove the T8 Torx screws to see what's inside the control panel. 

• Then, we will see the 4 layers of the control panel. 

Step 6 — The scanner mechanism 




• Remove the two T8 screws to detach the scanner cover. 

• Lift the cover up to reveal the scanner mechanism. 

• And we have our second DC motor and encoder. Plus, a carrier mechanism. 



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HP OfficeJet Pro L7580 Teardown 



Step 7 — Scanning head and sensor 




• Remove the scan head's top cover by pressing the two notches on the back. 

• Remove the T8 screws of the circuit board. 

• Here is the scanner sensor and the objective. 

Step 8 




• Remove all the screws from the back, including the ones inside the 3 covers. 

• Remove the two screws from the top of the cartridge-change cover. 

• Detach the two side covers by pulling them. 



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HP OfficeJet Pro L7580 Teardown 



Step 9 — Detaching the scanner section 




• Detach the back cover. 

• Remove the 4 screws from the both hinges. 

• The hinges can pop up suddenly, so be careful. 

• Then, remove the scanner cover to reveal the printing mechanism. 



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Step 10 




• Remove the screws on the cover. 

• You will notice the speaker below the cover. 

• Remove the screws holding the cartridge door. There is another slotted opto switch here. 



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HP OfficeJet Pro L7580 Teardown 



Step 11 




There is an extra weight block on the print mechanism to prevent vibration. 

• Remove the red marked screw to detach the ink hose. 

• Remove the green marked screw to detach the ink cartridge slot. 

• Finally, we have the ink hose and the nozzles. 

Step 12 — The ma inboard 




♦ Remove the screws to detach the mainboard of the printer. 

• The board has a power input, an Ethernet connector, a USB device port, phone line input 
and outputs, memory card slots, a USB host port, various internal connectors and a 
CR2032 RTC battery. 



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HP OfficeJet Pro L7580 Teardown 



Step 13 




• Remove the screws holding the print head's motor. 

• And we have a DC motor here. 

Step 14 




• Rotate the printer right to reach the other DC motor. 

• Remove the two screws connecting the motor to the body. 

• We will have another DC Motor. 



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HP OfficeJet Pro L7580 Teardown 



Step 15 




Remove the screw to get the slotted opto switches. 



Step 16 




• The L7580 has a lot of DC motors inside. Detach the ink cartridge slots by removing the 
screws to discover another DC motor. 



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HP OfficeJet Pro L7580 Teardown 



Step 17 — Ink cartridge mechanism 




• This is the ink cartridge pumping mechanism. The last DC motor we detached controls this 
mechanism. 

• The opto switch reports the mechanism's position. 

• Communication between the board and cartridges is being established by serial data line 
as I guess. 

Step 18 — Master print head 




• Then, we see here the print head cleaning mechanism. 

• The master print head (which includes two removable heads) has a circuit board inside. 

• And this is the paper type detector. It has been compacted a bit when comparing to 
previous versions. 



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HP OfficeJet Pro L7580 Teardown 



Step 19 




• Reaching to the bottom layer, this is the paper feeding mechanism. 

• By removing the top cover, we discover the sixth and the last DC motor with its encoder. 



Step 20 — The air pump 




• At the final step, we discover an air pump for the print head cleaning mechanism. It's 
surprising! 

last generated on 201 2-1 1-02 09:11:33 AM. 



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